Start Plone 6.1 upgrade guide

docs/backend/upgrading/version-specific-migration/index.md

@@ -26,5 +26,6 @@ upgrade-to-52
 upgrade-to-python3
 upgrade-zodb-to-python3
 upgrade-to-60
+upgrade-to-61
 migrate-to-volto
 ```

docs/backend/upgrading/version-specific-migration/upgrade-to-61.md

@@ -0,0 +1,71 @@
+---
+myst:
+ html_meta:
+ "description": "How to upgrade to Plone 6.1"
+ "property=og:description": "How to upgrade to Plone 6.1"
+ "property=og:title": "How to upgrade to Plone 6.1"
+ "keywords": "Upgrade, Plone 6"
+---
+
+(backend-upgrade-plone-v61-label)=
+
+# Upgrade Plone 6.0 to 6.1
+
+Plone 6.1 has seen the following major changes.
+Some may require changes in your setup.
+
+
+## TinyMCE upgraded in Classic UI
+
+In Plone 6.0, the Classic UI frontend uses TinyMCE 5, a rich text editor for websites.
+TinyMCE 5 reached its end of support on April 20, 2023.
+For Plone 6.1, Classic UI upgraded TinyMCE from version 5 to 7.
+
+If you upgrade a site using Classic UI from Plone 6.0 to 6.1, you do not need to take any action, unless you implemented custom plugins, or you use a plugin which got removed or moved to premium in TinyMCE versions 6 or 7.
+To upgrade your plugin implementation to TinyMCE 7, see the [upgrade guides](https://www.tiny.cloud/docs/tinymce/6/migration-from-5x/#plugins).
+
+
+### Enable the TinyMCE accordion plugin
+
+1. Go to the {guilabel}`Site Setup > General > TinyMCE` control panel to manage TinyMCE settings.
+1. Under the {guilabel}`Plugins and Toolbar` tab, check {guilabel}`accordion` to enable the accordion plugin.
+1. Under the same tab, add a menu entry `accordion` for TinyMCE in the control panel by editing the `items` key as shown.
+
+ ```json
+ {
+ "insert": {
+ "title": "Insert",
+ "items": "link media | template hr | accordion"
+ },
+ }
+ ```
+
+1. Click the {guilabel}`Save` button to save your settings.
+1. In the {guilabel}`Security > HTML filtering` control panel, add two new tags to {guilabel}`Valid tags`.
+
+ - `summary`
+ - `details`
+
+1. Also in the {guilabel}`Security > HTML filtering` control panel, add a new attribute to {guilabel}`Custom attributes`.
+
+ - `open`
+
+1. For a transform to valid markup of the Bootstrap 5 accordion, use an output filter.
+
+ ```{seealso}
+ - [Addon collective.outputfilters.tinymceaccordion](https://github.com/collective/collective.outputfilters.tinymceaccordion)
+ ```
+
+
+## `z3c.form` and `plone.app.z3cform`
+
+````{todo}
+This is a placeholder.
+
+- Update deprecated imports
+- New widget templates
+
+```{seealso}
+https://github.com/plone/plone.app.z3cform/pull/181
+```
+````